| Melbourne | 22:00 16 July |
| Tokyo | 21:00 16 July |
| Beijing | 20:00 16 July |
| Kolkata | 17:30 16 July |
| Moscow | 15:00 16 July |
| Riyadh | 15:00 16 July |
| Cairo | 14:00 16 July |
| Stockholm | 14:00 16 July |
| London | 13:00 16 July |
| New York | 08:00 16 July |
| Dallas | 07:00 16 July |
| Los Angeles | 05:00 16 July |
| International Date Line | 24:00 15 July |
| Time Zone Converter - Other cities | |
| Submission of Regular Papers | |
| Submission of Special Session Papers | |
| Submission Update Deadline | July 22, 2021 |
| Notification of Paper Acceptance | August 31, 2021 |
| Submission of Camera-Ready Papers | October 1, 2021 |
| Author (early-bird) Registration Deadline | October 1, 2021 |
Papers must be formatted according to the instructions in the APSIPA 2021 Paper Kit.
Please read the entire paper kit carefully to verify that your paper document is formatted correctly and that you have all the information you need before starting your paper submission. The paper kit contains detailed instructions on formatting your document and completing the submission process, as well as a description of how the review process works and how to prepare for your presentation at the conference if your paper is accepted.